This is the second start of my brotherinlaws Saito 84R3 radial engine with a Keleo muffler. It is an 84cc gas engine. He will be putting it in a TopFlite Focke Wulf 190 Giant scale ARF. I will be getting the same engine to put in my TopFlite P47 Giant scale ARF with some minor cowl adjustments. This engine is amazing! It has the sound of a Moki150 that everyone is looking for. If you want this sound though, you have to use a Keleo muffler which is in this video. This radial engine makes any warbird scale with an beautiful sound. Enjoy...